/*********************************************************************
 * Copyright (C) 2003 Andrew Khan
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ***************************************************************************/

package jxl.biff.formula;

import jxl.common.Logger;

/**
 * Ambiguously defined minus operator, used as a place holder when parsing
 * string formulas.  At this stage it could be either
 * a unary or binary operator - the string parser will deduce which and
 * create the appropriate type
 */
class Minus extends StringOperator {
    // The logger
    private static Logger logger = Logger.getLogger(StringOperator.class);

    /**
     * Constructor
     */
    public Minus() {
        super();
    }

    /**
     * Abstract method which gets the binary version of this operator
     */
    Operator getBinaryOperator() {
        return new Subtract();
    }

    /**
     * Abstract method which gets the unary version of this operator
     */
    Operator getUnaryOperator() {
        return new UnaryMinus();
    }

    /**
     * If this formula was on an imported sheet, check that
     * cell references to another sheet are warned appropriately
     * Does nothing, as operators don't have cell references
     */
    void handleImportedCellReferences() {
    }

}
